Not to get in to to much detail but..
Some ford truck converters are worth over 1000 bucks.
(I run a car lot and a automotive recycling facility)
I found this, which is supposed to prevent such thefts.
https://www.autoaccessoriesgarage.com/Exhaust/CatClamp-Catalytic-Converter-Lock/_Item/_485600001?utm_source=google&utm_medium=Exhaust&utm_campaign=GoogleProducts&utm_term=CatClamp-Catalytic-Converter-Lock&utm_content=surfaces&utm_campaignid=183743770&utm_adgroupid=37590802494&gclid=CjwKCAjw092IBhAwEiwAxR1lRmUfo7O9B8Dt3oFMvwlw4ZQ26VkAddTLoiS1lkMddl2K9LC9Xf75MxoCuZUQAvD_BwE